Voice Breaking in Males Results in Sexual Dimorphism of Green Woodhoopoe Calls

Radford, Andrew N.

doi:10.1163/1568539041166726

Cited by 27 publications

(18 citation statements)

References 40 publications

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“…In chicks of the Green Woodhoopoe "kek" calls were indistinguishable between sexes and only at the age of 3-5 months did the fundamental frequency of young males become twice as low as that of females (Radford 2004). Similarly, chick calls of American Coots were indistinguishable between sexes up to the age of 2-3 months, when female fundamental frequency decreased more than twice their original (Cosens 1981).…”

Section: Sexing Chicks By Voicementioning

confidence: 88%

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Gender identification using acoustic analysis in birds without external sexual dimorphism

Volodin

Volodina²,

Klenova

et al. 2015

Avian Res

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Zoo and wildlife management faces a problem with bird sexing, as many bird taxa have indiscernible gender differences in size and coloration. Problematic groups are geese, cranes, rails, raptors, owls, parrots, doves, auks, shearwaters and some passerines. Commonly accepted invasive sexing techniques based on genetics, laparoscopy, morphometric and on cloacal inspection, are all needed in bird capturing and handling. Capturing and subsequent manipulations may be inapplicable for free-ranging birds, whereas distant voice-based sexing is relevant for many species. This review evaluates the potential for noninvasive sexing by separate calls or duet calls, for adult birds of 69 species from 16 orders and for chicks of 11 species from 7 orders. For adult birds of 25 species, a single call per individual was sufficient for 100 % reliable sexing by ear or using spectrographic analysis. For chicks, the potential for voice-based sexing seems to be very limited. For birds calling rarely or unpredictably, we propose a simple way of provoking vocalization using playbacks of species-specific calls that are available from sound libraries. We conclude that sexing by voice may represent a feasible alternative to the classical sexing techniques, both in the wild and in captivity.

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Section: Sexing Chicks By Voicementioning

confidence: 88%

“…In the Green Woodhoopoe (Phoeniculus purpureus), "kek" calls were twice as low in fundamental frequency in males as in females (Radford 2004). The values of fundamental frequency did not overlap between sexes; these were lower than 600 Hz in males and higher than 700 Hz in females, which ensured 100 % reliable sexing.…”

Section: Order Coraciiformesmentioning

confidence: 95%

Gender identification using acoustic analysis in birds without external sexual dimorphism

Volodin

Volodina²,

Klenova

et al. 2015

Avian Res

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“…Fourth, how do group members of different sex and dominance status adjust their allopreening following intergroup conflict? Males and females are predicted to show similar changes in allopreening because they contribute equally to intergroup conflicts (Radford 2003); the dominant breeding pair and subordinate non-breeding helpers may increase their allopreening to different extents because the latter expend more effort in intergroup conflicts (Radford 2003 (Radford & du Plessis 2003) and vocalizations (Radford 2004b). Dominance status can be established during foraging, when the members of the putative breeding pair displace samesex helpers (Radford & du Plessis 2003).…”

Section: Introductionmentioning

confidence: 99%

Duration and outcome of intergroup conflict influences intragroup affiliative behaviour

Radford

2008

Proc. R. Soc. B.

123

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Theoreticians have long suggested that the amount of intergroup conflict in which a group is involved could influence the level of cooperation or affiliation displayed by its members. Despite the prevalence of intergroup conflicts in many social animal species, however, few empirical studies have investigated this potential link. Here, I show that intragroup allopreening rates are highest in green woodhoopoe (Phoeniculus purpureus) groups that have the greatest involvement in intergroup conflict. One reason for this relationship is a post-conflict increase in allopreening, and I demonstrate for the first time that both conflict duration and outcome influence subsequent allopreening rates: group members allopreened more following long conflicts and those they lost compared with short conflicts and those they won, perhaps because the former are more stressful. The increase in affiliative behaviour was the result of more allopreening of subordinate helpers by the dominant breeding pair, which may be because the breeders are trying to encourage helpers to participate in future conflicts; relative group size influences conflict outcome and helpers contribute more to conflicts than do the breeding pair. These results emphasize that our understanding of cooperation and group dynamics can be enhanced by investigations of how intergroup interactions affect intragroup processes.

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“…) or fatigue (Vannoni & McElligott ). Voice ‘breaking’ has been noted in several species of birds, and it is possible that the vocal shifts observed in the atonal chatter may correspond to the ageing of the birds (Radford ; Klenova et al. ).…”

Section: Discussionmentioning

confidence: 99%

Vocal Cues to Identity: Pied Babblers Produce Individually Distinct But Not Stable Loud Calls

et al. 2016

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The ability to identify social partners can play a key role in the coordination of social behaviours in group‐living animals. Coordinating social behaviours over long distances becomes problematic, as cues to identity are often limited to one or two sensory modalities. This limitation can often select for strong individuality in those cues used for long‐distance communication. Pied babblers, Turdoides bicolor, produce a number of different types of ‘loud calls’ which are frequently used to signal to individuals beyond the range of visual or olfactory pathways of communication. Here, we show that three of these ‘loud call’ types, the v‐shaped chatter, the double note ascending chatter and the atonal chatter, are each individually distinct. We hypothesise that individuality in the three loud call types tested here may represent a possible pathway to social recognition in this species that may have important consequences for social interactions. However, we also found that the atonal chatter was unstable between years suggesting that this particular call type may not be a reliable long‐term indicator to identity which may affect long‐term recognition in this species.

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Voice Breaking in Males Results in Sexual Dimorphism of Green Woodhoopoe Calls

Cited by 27 publications

References 40 publications

Gender identification using acoustic analysis in birds without external sexual dimorphism

Gender identification using acoustic analysis in birds without external sexual dimorphism

Duration and outcome of intergroup conflict influences intragroup affiliative behaviour

Vocal Cues to Identity: Pied Babblers Produce Individually Distinct But Not Stable Loud Calls

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